Extranodal natural killer/T-cell lymphoma (ENKTCL), nasal type, is a rare subtype of non-Hodgkin lymphoma (NHL) with relatively high incidence in China. L-asparaginase based chemotherapy improved overall response and prolonged the long-term survival for patients with stage IV. But the optimal treatment schedule has not been established. This study is designed with four cycles MEDA chemotherapy, followed by Auto-HSCT for stage IV patients with newly onset, relapsed or refractory diseases. The efficacy and safety of this protocol in the treatment of will be measured.